[Swift] Replace IntervalSet.setReadonly with makeReadonly. #2113
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Replace IntervalSet.setReadonly(Bool) with makeReadonly(). This operation only ever works in one direction, and would throw an exception if a caller attempted to make a read-only IntervalSet read-write again. By changing the interface we remove the need to check this, and so we don't need to declare the exception. Unlike in the Java runtime, we need to declare the possibility of the exception at the callsite, so this was pointlessly cluttering.
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Replace IntervalSet.setReadonly(Bool) with makeReadonly(). This
operation only ever works in one direction, and would throw an exception
if a caller attempted to make a read-only IntervalSet read-write again.
By changing the interface we remove the need to check this, and so we
don't need to declare the exception. Unlike in the Java runtime, we
need to declare the possibility of the exception at the callsite, so this
was pointlessly cluttering.